KR20070000459A - Method for improving heat dissipation in encapsulated electronic components - Google Patents
Method for improving heat dissipation in encapsulated electronic components Download PDFInfo
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- KR20070000459A KR20070000459A KR1020067015444A KR20067015444A KR20070000459A KR 20070000459 A KR20070000459 A KR 20070000459A KR 1020067015444 A KR1020067015444 A KR 1020067015444A KR 20067015444 A KR20067015444 A KR 20067015444A KR 20070000459 A KR20070000459 A KR 20070000459A
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- H03H9/1064—Mounting in enclosures for surface acoustic wave [SAW] devices
- H03H9/1078—Mounting in enclosures for surface acoustic wave [SAW] devices the enclosure being defined by a foil covering the non-active sides of the SAW device
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- H03H2003/025—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks the resonators or networks comprising an acoustic mirror
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
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Abstract
보통 칩-사이즈 SAW 패키지로 지칭되는 캡슐화된 전자 패키지에서 열 소산을 개선하기 위한 방법이 제공된다. 상기 패키지는 다이상에 제조된 하나 이상의 탄성파 소자들을 포함하고, 상기 다이는 전기적으로 도전성을 지닌 범프들에 의해 분리된 전기적으로 비-도전성 캐리어상에 배치된다. 상기 패키지의 상부는 라미네이트 및 밀봉층에 의해 덮여져 있다. 상기 라미네이트의 일부를 제거한 후 상기 패키지상에 열 전도 물질층을 배치함으로써 그리고 상기 캐리어를 관통하는 하나 이상의 열 전도 경로들을 제공함으로써 열 소산이 개선될 수 있다.A method is provided for improving heat dissipation in an encapsulated electronic package, commonly referred to as a chip-size SAW package. The package includes one or more acoustic wave elements fabricated on a die, wherein the die is disposed on an electrically non-conductive carrier separated by electrically conductive bumps. The top of the package is covered by a laminate and a sealing layer. Heat dissipation can be improved by removing a portion of the laminate and then placing a layer of thermally conductive material on the package and by providing one or more thermally conductive paths through the carrier.
Description
본 발명은 일반적으로 캡슐화된 전자 요소들에 관한 것으로, 특히 칩-사이즈 표면 탄성파(SAW) 패키지에 관한 것이다.The present invention relates generally to encapsulated electronic elements, and more particularly to a chip-size surface acoustic wave (SAW) package.
벌크 탄성파(BAW) 소자는 일반적으로 전극 역할을 하는 두개의 전기적으로 도전성이 있는 층들 사이에 끼워져 있는 압전층을 포함하는 것으로 알려져 있다. 무선 주파수(RF) 신호가 상기 소자를 가로질러 인가되는 경우, 그것은 상기 압전층에서 기계적인 파동을 생성한다. (상기 RF 신호에 의해 생성된) 상기 기계적/음향파의 파장이 상기 압전층의 두께의 약 두배인 경우 기본적인 공진이 발생한다. BAW 소자의 공진 주파수가 다른 요인들에 의존할지라도, 상기 압전층의 두께는 상기 공진 주파수를 결정하는데 주된 요인이다. 상기 압전층의 두께가 감소할수록, 상기 공진 주파수는 증가한다. BAW 소자들은 전통적으로 수정으로 된 시트들상에 제조되었다. 일반적으로, 상기 제조 방법을 사용하여 높은 공진 주파수를 가진 소자를 획득하는 것은 어렵다. 패시브(passive) 기판 물질들상에 박막 층들을 증착하여 BAW 소자들을 제조시, 공진 주파수는 0.5-10 GHz 범위까지 확장될 수 있다. 이러한 유형의 BAW 소자들은 일반적으로 박막 벌크 탄성파 공진기들 또는 FBARs로 지칭된다. 주로 두가지 유형의 FBARs이 존재하는데, BAW 공진기들 및 적층된 수정 필터들(SCFs)이 존재한다. 이들 두가지 유형의 소자들 간의 차이점은 주로 그들의 구조에 존재한다. SCF는 보통 두개 이상의 압전층들 및 3개 이상의 전극들을 구비하는데, 몇몇 전극들은 접지되어 있다. FBARs들은 보통 통과 대역 또는 저지 대역 필터들을 생성하기 위하여 조합하여 사용된다. 하나의 직렬 FBAR와 하나의 병렬 FBAR의 조합은 소위 사다리꼴 필터의 하나의 섹션을 형성한다. 사다리꼴 필터들에 관한 설명은 예를 들어 엘라(Ella)(미국 특허 번호 6,081,171)에서 발견될 수 있다. 엘라에 개시된 바와 같이, FBAR-기반 소자는 일반적으로 패시베이션 층들로 지칭되는 하나 이상의 보호층들을 가질 수 있다. 전형적인 FBAR-기반 소자가 도 1에 도시되어 있다. 도 1에 도시된 바와 같이, FBAR 소자(1)는 기판(2), 하부 전극(4), 압전층(6), 상부 전극(8), 튜닝층(20) 및 패시베이션 층(10)을 포함한다. 상기 FBAR 소자(1)는 음향 미러(12)를 부가적으로 포함할 수 있는데, 상기 음향 미러(12)는 낮은 음향 임피던스를 지닌 두개의 층들(14 및 18) 사이에 끼워져 있는 높은 음향 임피던스를 지닌 층(16)을 포함한다. 상기 미러는 보통 높은 임피던스와 낮은 임피던스 층들의 쌍들로 구성되는데(짝수개의 층들) 항상 그런 것은 아니다. 몇몇 미러들은 SiO2, W, SiO2, W와 같은 순서로 배열된 층들의 두개의 쌍들로 구성된다. 상기 미러 대신에, FBAR 소자는 SiO2로 된 하나 이상의 멤브레인 층들 및 희생층을 부가적으로 포함할 수 있다. 상기 기판(2)은 실리콘(Si), 2산화 규소(SiO2), 갈륨 비소(GaAs), 유리 또는 세라믹 물질들로부터 형성될 수 있다. 상기 하부 전극(4)과 상부 전극(8)은 금(Au), 몰리브덴(Mo), 텅스텐(W), 구리(Cu), 니켈(Ni), 니오븀(Nb), 은(Ag), 탄탈(Ta), 코발트(Co), 알루미늄(Al), 티타늄(Ti) 또는 다른 전기적으로 도전성을 지닌 물질들로부터 형성될 수 있다. 상기 압전층(6)은 산화 아연(ZnS), 황화 아연(ZnS), 질화 알루미늄(AlN), 탄탈산 리튬(LiTaO3) 또는 소위 납 란탄 지르콘산 티탄산 계열의 다른 멤버들로부터 형성될 수 있다. 상기 패시베이션 층은 SiO2, Si3N4 또는 폴리이미드로부터 형성될 수 있다. 상기 낮은 음향 임피던스 층들(14 및 18)은 Si, SiO2, 폴리-실리콘, Al 또는 폴리머로부터 형성될 수 있다. 상기 높은 음향 임피던스 층(16)은 Au, Mo 또는 텅스텐(W)으로부터 형성될 수 있고, 몇몇 경우에, 다수의 층 쌍들을 형성하기 위하여 AIN과 같은 유전체로부터 형성될 수 있다. 전형적으로 FBAR 사다리꼴 필터들은 직렬 공진기들이 요망하거나 설계된 각 필터들의 중심 주파수와 대략 동일하거나 부근인 주파수에서 직렬 공진을 야기하도록 설계된다. 유사하게, 분기 또는 병렬 공진기들은 상기 직렬 FBAR 공진으로부터 약간 오프셋된 주파수에서 병렬 공진을 야기한다. 상기 직렬 공진기들은 보통 상기 중심 주파수에서 전송시 그들의 최대 피크를 가지도록 설계되어, 신호들은 상기 직렬 공진기들을 통해 전송된다. 대조적으로, 병렬 공진기들은 신호들이 접지에 단락되지 않도록 전송시 그들의 최소값을 가지도록 설계된다. FBARs는 상기 소자내에서 사용된 다른 물질들 및 층들의 유형과 같은 다른 인자들에 부가하여, 상기 소자들을 제조하는데 사용된 압전 물질들의 압전 계수의 함수인 양만큼 상이한 주파수들에서 병렬 공진과 직렬 공진을 야기한다. 특히, FBAR 사다리꼴 필터들은 상기 공진기들의 압전층들을 형성하는데 사용된 물질들의 유형들과 상기 소자내의 다양한 층들의 두께의 함수인 대역폭들을 지닌 통과 대역들을 초래한다.Bulk acoustic wave (BAW) devices are generally known to include piezoelectric layers sandwiched between two electrically conductive layers that serve as electrodes. When a radio frequency (RF) signal is applied across the device, it creates a mechanical wave in the piezoelectric layer. Basic resonance occurs when the wavelength of the mechanical / acoustic wave (generated by the RF signal) is about twice the thickness of the piezoelectric layer. Although the resonant frequency of the BAW element depends on other factors, the thickness of the piezoelectric layer is a major factor in determining the resonant frequency. As the thickness of the piezoelectric layer decreases, the resonance frequency increases. BAW devices have traditionally been fabricated on quartz sheets. In general, it is difficult to obtain a device having a high resonance frequency using the above manufacturing method. In fabricating BAW devices by depositing thin film layers on passive substrate materials, the resonant frequency can be extended to a range of 0.5-10 GHz. BAW devices of this type are generally referred to as thin film bulk acoustic wave resonators or FBARs. There are mainly two types of FBARs, BAW resonators and stacked quartz filters (SCFs). The difference between these two types of devices is mainly in their structure. SCFs usually have two or more piezoelectric layers and three or more electrodes, some of which are grounded. FBARs are commonly used in combination to create passband or stopband filters. The combination of one series FBAR and one parallel FBAR forms one section of a so-called trapezoidal filter. A description of trapezoidal filters can be found, for example, in Ella (US Pat. No. 6,081,171). As disclosed in Ella, an FBAR-based device may have one or more protective layers, generally referred to as passivation layers. A typical FBAR-based device is shown in FIG. As shown in FIG. 1, the FBAR device 1 includes a substrate 2, a lower electrode 4, a piezoelectric layer 6, an upper electrode 8, a tuning layer 20 and a passivation layer 10. do. The FBAR element 1 may additionally comprise an acoustic mirror 12, which has a high acoustic impedance sandwiched between two layers 14 and 18 with low acoustic impedance. Layer 16. The mirror is usually composed of pairs of high and low impedance layers (even layers), but not always. Some mirrors consist of two pairs of layers arranged in the same order as SiO2, W, SiO2, W. Instead of the mirror, the FBAR device may additionally comprise one or more membrane layers and a sacrificial layer of SiO 2. The substrate 2 may be formed from silicon (Si), silicon dioxide (SiO 2), gallium arsenide (GaAs), glass or ceramic materials. The lower electrode 4 and the upper electrode 8 include gold (Au), molybdenum (Mo), tungsten (W), copper (Cu), nickel (Ni), niobium (Nb), silver (Ag), and tantalum ( Ta), cobalt (Co), aluminum (Al), titanium (Ti) or other electrically conductive materials. The piezoelectric layer 6 may be formed from zinc oxide (ZnS), zinc sulfide (ZnS), aluminum nitride (AlN), lithium tantalate (LiTaO 3 ), or other members of the so-called lead lanthanum zirconate titanic acid series. The passivation layer may be formed from SiO 2, Si 3 N 4 or polyimide. The low acoustic impedance layers 14 and 18 may be formed from Si, SiO 2, poly-silicon, Al or a polymer. The high acoustic impedance layer 16 may be formed from Au, Mo or tungsten (W), and in some cases may be formed from a dielectric such as AIN to form multiple layer pairs. Typically FBAR trapezoidal filters are designed so that the series resonators cause series resonance at a frequency that is approximately equal to or near the center frequency of each filter desired or designed. Similarly, branched or parallel resonators cause parallel resonance at a frequency slightly offset from the series FBAR resonance. The series resonators are usually designed to have their maximum peak when transmitted at the center frequency, so that signals are transmitted through the series resonators. In contrast, parallel resonators are designed to have their minimum in transmission so that signals are not shorted to ground. FBARs, in addition to other factors, such as the type of layers and other materials used in the device, may be parallel and series resonant at different frequencies by an amount that is a function of the piezoelectric coefficient of the piezoelectric materials used to manufacture the device. Cause. In particular, FBAR trapezoidal filters result in passbands with bandwidths that are a function of the types of materials used to form the piezoelectric layers of the resonators and the thickness of the various layers in the device.
플립-칩 기술은 캡슐화된 패키지에서 FBAR 필터들을 조립하는데 사용되었다. 플립-칩은 다이를 패키지 캐리어에 전기적으로 연결하는 방법을 기술하는 용어이다. 다이는 기본적으로 도 2에 도시된 바와 같이, 상부에 제조된 FBAR 필터들과 같이, 하나 이상의 능동 요소들을 지닌 기판이다. 도시된 바와 같이, 상기 다이(30)는 기판(2) 및 두개의 능동 요소들 또는 칩들(1)을 포함한다. 상기 기판은 보통 실리콘 웨이퍼의 일부이다. 상기 패키지 캐리어는 저온 동시 소성 세라믹(LTCC) 또는 고온 동시 소성 세라믹(HTCC)으로 형성된 회로 기판이다. 플립-칩 패키지를 형성하는 프로세스에서, 상기 다이는 면이 아래로 향하게 배치되어, 상기 칩들(1)은 패키지 캐리어를 마주보고 있다. 상기 다이와 상기 패키지 캐리어 간의 전기 접점들은 상기 다이와 상기 패키지 캐리어에 본딩된 복수의 와이어들에 의해 구현된다. 더 일반적으로, 전기적으로 도전성을 지닌 "범프들(bumps)"이 상기 다이와 상기 패키지 캐리어 사이에 배치된다.Flip-chip technology has been used to assemble FBAR filters in an encapsulated package. Flip-chip is a term describing a method of electrically connecting a die to a package carrier. The die is basically a substrate with one or more active elements, such as FBAR filters fabricated on top, as shown in FIG. As shown, the die 30 comprises a substrate 2 and two active elements or chips 1. The substrate is usually part of a silicon wafer. The package carrier is a circuit board formed of low temperature cofired ceramic (LTCC) or high temperature cofired ceramic (HTCC). In the process of forming a flip-chip package, the die is placed face down, so that the chips 1 face the package carrier. Electrical contacts between the die and the package carrier are implemented by a plurality of wires bonded to the die and the package carrier. More generally, electrically conductive "bumps" are disposed between the die and the package carrier.
상기 플립-칩 프로세스가 도 3a 내지 도 3d에 도시되어 있다. 도 3a에 도시된 바와 같이, 복수의 다이들(30)이 복수의 범프들(52)에 의해 전기적으로 연결된, 패키지 캐리어(50)상에 장착된다. 도 3b에 도시된 바와 같이, 이웃하는 다이들 사이의 영역과 전체 다이(30)를 덮는, 라미네이션 물질(40) 층이 상기 패키지의 상부에 증착된다. 상기 라미네이트(40)는 전형적으로 에스판덱스(Espandex)(상표명) 비점착 폴리이미드와 같은, 폴리이미드로 형성된다. 상기 라미네이트(40)가 상기 칩들(1)과 상기 다이(30)에 기계적인 보호를 제공할 수 있는 반면에, 그것은 밀봉적이지 않다. 시간이 경과하면, 수증기가 상기 라미네이트(40)에 침투하여 상기 칩들에 손상을 야기할 수 있다. 따라서, 상기 패키지를 오염에 대해 밀봉적으로 밀봉하기 위하여 다른 물질이 사용된다. 이러한 이유로, 이웃하는 다이들(30) 사이의 영역을 덮는 상기 라미네이트(40)의 일부는 도 3c에 도시된 바와 같이, 상기 패키지 캐리어(50)의 몇몇 섹션들을 노출시키도록 제거된다. 도 3d에 도시된 바와 같이, 밀봉층(42)이 상기 라미네이트(40)의 상부 및 상기 패키지 캐리어(50)의 섹션들 상에 인가된다. 상기 밀봉층(42)은 보통 구리 등으로 형성된다. 후속적으로 상기 패키지 캐리어는 도 4에 도시된 바와 같이, 개별 패키지들(60)로 절단된다.The flip-chip process is shown in FIGS. 3A-3D. As shown in FIG. 3A, a plurality of dies 30 are mounted on a package carrier 50, electrically connected by a plurality of bumps 52. As shown in FIG. 3B, a layer of lamination material 40 is deposited on top of the package, covering the region between neighboring dies and the entire die 30. The laminate 40 is typically formed of polyimide, such as Espanedex ™ non-tacky polyimide. While the laminate 40 may provide mechanical protection to the chips 1 and the die 30, it is not sealable. Over time, water vapor may penetrate the laminate 40 and cause damage to the chips. Thus, other materials are used to seal the package sealingly against contamination. For this reason, a portion of the laminate 40 covering the area between neighboring dies 30 is removed to expose some sections of the package carrier 50, as shown in FIG. 3C. As shown in FIG. 3D, a sealing layer 42 is applied on top of the laminate 40 and on sections of the package carrier 50. The sealing layer 42 is usually formed of copper or the like. Subsequently the package carrier is cut into individual packages 60, as shown in FIG. 4.
개별 패키지(60)가 도 4에 도시되어 있다. 상기 패키지는 일반적으로 칩-사이즈 SAW 패키지(CSSP)로 지칭된다. 도면에 도시된 바와 같이, 상기 패키지 내부의 칩들(1)은 복수의 범프들(52) 및 상호연결 비아들(54)을 통해 외부 전기 회로(70)에 전기적으로 연결된다. 상기 회로(70)는 또한 표면-장착 소자(SMD) 패드로 알려져 있고, 상기 상호연결 비아들(54)은 스루-접점들로 지칭된다.The individual package 60 is shown in FIG. 4. The package is generally referred to as a chip-size SAW package (CSSP). As shown in the figure, chips 1 within the package are electrically connected to an external electrical circuit 70 through a plurality of bumps 52 and interconnect vias 54. The circuit 70 is also known as a surface-mount device (SMD) pad and the interconnect vias 54 are referred to as through-contacts.
전형적인 FBAR 필터들에 있어서, 특히 높은 전력 레벨들 하에서, 상기 필터 칩 내부의 내부 열 분포가 문제가 될 수 있다. 균일하지 않은 내부 열 분포는 상기 FBAR 필터 또는 듀플렉서에서 최고 사용가능한 전력 레벨을 제한한다. 특히, 상기 FBAR 필터들 및 듀플렉서들이 캡슐화된 패키지상에 배치되는 경우, 열 소산(heat dissipation)이 주된 관심사이다. 전력 내구성을 증강시키기 위하여 이러한 패키지에서 열 소산을 개선하는 것이 유리하고 바람직하다.In typical FBAR filters, especially under high power levels, the internal heat distribution inside the filter chip can be a problem. Uneven internal heat distribution limits the highest usable power level in the FBAR filter or duplexer. In particular, heat dissipation is of primary concern when the FBAR filters and duplexers are placed in an encapsulated package. It is advantageous and desirable to improve heat dissipation in such packages to enhance power endurance.
도 1은 박막 벌크 탄성파 공진기를 도시한 개략도이다.1 is a schematic diagram illustrating a thin film bulk acoustic wave resonator.
도 2는 다이를 도시한 개략도이다.2 is a schematic diagram illustrating a die.
도 3a는 플립-칩 패키징 프로세스에서 캐리어상에 장착되는 복수의 다이들을 도시한 개략도이다.3A is a schematic diagram illustrating a plurality of dies mounted on a carrier in a flip-chip packaging process.
도 3b는 상기 캐리어의 상부 및 그위에 장착된 다이들에 인가되는 라미네이트를 도시한 개략도이다.3B is a schematic diagram illustrating a laminate applied to the top of the carrier and dies mounted thereon.
도 3c는 제거되는 라미네이트의 일부를 도시한 개략도이다.3C is a schematic diagram showing a portion of the laminate being removed.
도 3d는 상기 라미네이트의 상부에 인가되는 밀봉층을 도시한 개략도이다.3D is a schematic diagram showing a sealing layer applied on top of the laminate.
도 4는 개별 칩-사이즈 SAW 패키지(CSSP)를 도시한 개략도이다.4 is a schematic diagram illustrating an individual chip-size SAW package (CSSP).
도 5는 본 발명에 따라, 제거되는 CSSP의 상부의 라미네이트를 도시한 개략도이다.5 is a schematic diagram illustrating a laminate on top of a CSSP to be removed, in accordance with the present invention.
도 6a는 플립-칩 패키징 프로세스동안 제거되는 CSSP들의 상부의 라미네이트를 도시한 개략도이다.6A is a schematic diagram illustrating a laminate on top of CSSPs removed during the flip-chip packaging process.
도 6b는 플립-칩 패키징 프로세스동안 다른 단계에서 제거되는 CSSP들의 상부의 라미네이트를 도시한 개략도이다.6B is a schematic diagram illustrating a laminate on top of CSSPs removed at another step during the flip-chip packaging process.
도 7은 본 발명에 따라, 열 소산을 개선하기 위하여 변경된 CSSP의 상부에 증착된 밀봉 물질의 두꺼운 층을 도시한 개략도이다.7 is a schematic diagram illustrating a thick layer of sealing material deposited on top of a modified CSSP to improve heat dissipation, in accordance with the present invention.
도 8은 본 발명에 따라, CSSP의 캐리어에 제공된 열 경로들을 도시한 개략도이다.8 is a schematic diagram illustrating thermal paths provided to a carrier of a CSSP, in accordance with the present invention.
도 9는 본 발명의 다른 실시예를 도시한 개략도이다.9 is a schematic diagram showing another embodiment of the present invention.
도 10은 열 소산을 추가로 개선하기 위하여 밀봉 물질의 상부에 배치된 열 전도층을 도시한 개략도이다.10 is a schematic diagram illustrating a heat conducting layer disposed on top of a sealing material to further improve heat dissipation.
도 11은 본 발명에 따라, 음향 미러와 기판 사이에 배치된 열 전도 유전층을 지닌 FBAR 소자를 도시한 개략도이다.11 is a schematic diagram illustrating an FBAR device having a thermally conductive dielectric layer disposed between an acoustic mirror and a substrate, in accordance with the present invention.
본 발명의 주된 목적은 캡슐화된 전자 패키지에서 열 소산을 개선하는 것으로서, 상기 패키지는 전기적으로 도전성이 없는 캐리어상에 배치된, 다이상에 제조된 하나 이상의 전자 요소들을 포함한다. 상기 다이는 상기 다이와 상기 캐리어의 상부면 사이의 복수의 전기적으로 도전성이 있는 범프들을 통해 그리고 상기 상부면을 상기 캐리어의 하부면에 연결하는 복수의 상호연결 비아들을 통해 외부 회로에 전기적으로 연결된다. 상기 패키지의 상부에서, 상기 다이의 배면을 덮는 밀봉 금속층 및 라미네이트는 내부의 전자 요소들을 캡슐화하는데 사용된다. 상기 목적은 다음에 의해 달성될 수 있다.It is a primary object of the present invention to improve heat dissipation in an encapsulated electronic package, the package comprising one or more electronic elements fabricated on a die, disposed on an electrically nonconductive carrier. The die is electrically connected to an external circuit through a plurality of electrically conductive bumps between the die and the top surface of the carrier and through a plurality of interconnecting vias connecting the top surface to the bottom surface of the carrier. At the top of the package, a sealing metal layer and laminate covering the back of the die is used to encapsulate the electronic elements therein. This object can be achieved by:
1) 상기 패키지의 상부를 덮는 라미네이트의 일부를 감소시키거나 제거하는 것,1) reducing or removing a portion of the laminate covering the top of the package,
2) 상기 패키지의 상부에 열 전도 물질층을 증착하는 것, 상기 열 전도 물질은 또한 상기 밀봉의 일부로서 사용된다,2) depositing a layer of heat conducting material on top of the package, the heat conducting material also being used as part of the seal,
3) 상기 캐리어의 상부면상의 밀봉층을 상기 캐리어의 하부면상의 열 전도성이 있는 요소들에 열적으로(thermally) 연결하는, 상기 캐리어를 관통하는 하나 이상의 열 경로들을 제공하는 것.3) providing one or more thermal paths through the carrier thermally connecting a sealing layer on the upper surface of the carrier to thermally conductive elements on the lower surface of the carrier.
따라서, 본 발명의 제1 태양은 캡슐화된 전자 소자에서 열 소산을 개선하기 위한 방법을 제공하는데, 상기 캡슐화된 소자는,Accordingly, a first aspect of the invention provides a method for improving heat dissipation in an encapsulated electronic device, the encapsulated device comprising:
제1면 및 대향하는 제2면을 구비하는 캐리어;A carrier having a first side and an opposing second side;
상기 캐리어의 제1면상에 배치된 복수의 전기적으로 도전성이 있는 범프들;A plurality of electrically conductive bumps disposed on the first surface of the carrier;
상기 캐리어의 제2면상에 배치된 복수의 전기적으로 도전성이 있는 세그먼트들;A plurality of electrically conductive segments disposed on the second surface of the carrier;
상기 범프들을 상기 전기적으로 도전성이 있는 세그먼트들에 전기적으로 연결하기 위하여, 상기 캐리어의 제1면 및 제2면 사이에 제공된, 복수의 전기적으로 도전성이 있는 경로들;A plurality of electrically conductive paths provided between the first and second surfaces of the carrier for electrically connecting the bumps to the electrically conductive segments;
상기 전기적으로 도전성이 있는 경로들 및 범프들을 통해 상기 전기적으로 도전성이 있는 세그먼트들에 전기적으로 연결된, 상기 범프들의 상부에 배치된 다이;A die disposed on top of the bumps, electrically connected to the electrically conductive segments via the electrically conductive paths and bumps;
상기 다이의 상부 및 상기 캐리어의 제1면의 적어도 일부분에 제공된 라미네이트; 및A laminate provided on top of the die and at least a portion of the first side of the carrier; And
상기 라미네이트 및 상기 캐리어의 제1면의 다른 부분을 덮는 밀봉층을 포함한다. 상기 방법은,A sealing layer covering the laminate and another portion of the first surface of the carrier. The method,
클리어된 영역을 제공하기 위하여 상기 다이의 상부에서 상기 라미네이트의 일부를 제거하는 단계; 및Removing a portion of the laminate on top of the die to provide a cleared area; And
열 전도층을 통해 상기 캡슐화된 소자의 열 소산을 개선하기 위하여, 상기 클리어된 영역상에 열 전도층을 제공하는 단계를 포함한다.Providing a thermally conductive layer on the cleared area to improve heat dissipation of the encapsulated device through the thermally conductive layer.
상기 방법은, 상기 캐리어의 제1면상의 밀봉층을 상기 캐리어의 제2면에 열적으로 연결하는, 상기 캐리어를 관통하는 적어도 하나의 열 전도 경로를 제공하는 단계를 더 포함한다.The method further includes providing at least one heat conduction path through the carrier that thermally connects a sealing layer on the first face of the carrier to the second face of the carrier.
상기 열 전도층은 금속층 및 추가 밀봉층을 포함할 수 있다.The heat conducting layer may comprise a metal layer and an additional sealing layer.
상기 열 전도층은 나머지 라미네이트 부분의 적어도 일부를 덮도록 상기 클리어된 영역 외부로 확장될 수 있다.The thermally conductive layer can extend out of the cleared area to cover at least a portion of the remaining laminate portion.
본 발명에 의하면, 상기 다이는 박막 벌크 탄성파 공진기(FBAR) 소자들을 포함하여, 하나 이상의 탄성파 소자들을 포함한다. 상기 FBAR 소자는 음향 미러 및 기판을 포함할 수 있고, 상기 음향 미러와 상기 기판 사이에 배치된 질화 알루미늄과 같은, 열 전도 유전층을 포함할 수 있다.According to the invention, the die comprises one or more acoustic wave elements, including thin film bulk acoustic wave resonator (FBAR) elements. The FBAR device may include an acoustic mirror and a substrate, and may include a thermally conductive dielectric layer, such as aluminum nitride, disposed between the acoustic mirror and the substrate.
본 발명의 제2 태양은,The second aspect of the present invention,
제1면 및 대향하는 제2면을 구비하는 캐리어;A carrier having a first side and an opposing second side;
상기 캐리어의 제1면상에 배치된 복수의 전기적으로 도전성이 있는 범프들;A plurality of electrically conductive bumps disposed on the first surface of the carrier;
상기 캐리어의 제2면상에 배치된 복수의 전기적으로 도전성이 있는 세그먼트들;A plurality of electrically conductive segments disposed on the second surface of the carrier;
상기 범프들을 상기 제2면상의 상기 전기적으로 도전성이 있는 세그먼트들에 전기적으로 연결하기 위하여, 상기 캐리어의 제1면 및 제2면 사이에 제공된, 복수의 전기적으로 도전성이 있는 경로들;A plurality of electrically conductive paths provided between the first and second surfaces of the carrier for electrically connecting the bumps to the electrically conductive segments on the second surface;
제1면 및 제2면을 구비하는 다이로서, 상기 다이는 상기 범프들의 상부에 배치되고, 상기 전기적으로 도전성이 있는 경로들 및 범프들을 통해 상기 다이의 제1면을 상기 캐리어의 제2면상의 전기적으로 도전성이 있는 세그먼트들에 전기적으로 연결하며, 상기 다이의 제2면은 내부 영역 및 상기 내부 영역을 둘러싸는 외부 영역을 구비하는 다이;A die having a first side and a second side, the die being disposed on top of the bumps and passing the first side of the die on the second side of the carrier through the electrically conductive paths and bumps; A die electrically connected to electrically conductive segments, the second side of the die having an inner region and an outer region surrounding the inner region;
상기 다이의 제2면의 외부 영역 및 상기 캐리어의 제1면의 적어도 일부분에 적어도 제공되는 라미네이트; 및A laminate provided at least in an outer region of the second side of the die and at least a portion of the first side of the carrier; And
상기 라미네이트, 상기 다이의 제2면의 내부 영역 및 상기 캐리어의 제1면의 다른 부분을 덮는 밀봉층으로서, 열 전도층을 포함하는 밀봉층을 포함하는 캡슐화된 전자 소자를 제공한다.A sealing layer covering the laminate, an inner region of the second side of the die and another portion of the first side of the carrier, the encapsulated electronic device comprising a sealing layer comprising a heat conducting layer.
상기 다이의 제2면의 내부 영역을 덮는 상기 밀봉층은 상기 라미네이트를 덮는 밀봉층보다 더 두껍다.The sealing layer covering the inner region of the second side of the die is thicker than the sealing layer covering the laminate.
상기 라미네이트는 상기 다이의 제2면과 상기 밀봉층 사이의 내부 영역에 또한 제공될 수 있고, 상기 내부 영역상에 제공된 상기 라미네이트는 상기 제2면의 외부 영역을 덮는 라미네이트보다 더 얇다.The laminate may also be provided in an inner region between the second side of the die and the sealing layer, wherein the laminate provided on the inner region is thinner than a laminate covering the outer region of the second side.
상기 소자는 상기 캐리어의 제1면상의 밀봉층을 상기 캐리어의 제2면에 열적으로 전도하는, 상기 캐리어를 관통하는 적어도 하나의 열 전도 경로를 더 포함할 수 있다.The device may further comprise at least one heat conduction path through the carrier, thermally conducting a sealing layer on the first face of the carrier to the second face of the carrier.
본 발명은 도 5 내지 도 10과 함께 취해지는 상세한 설명을 읽을 때 명백해질 것이다.The invention will become apparent upon reading the detailed description taken in conjunction with FIGS.
도 4에 도시된 칩-사이즈 SAW 패키지(CSSP)와 같은, 캡슐화된 패키지에서, 캡슐화된 패키지 내부에서 생성된 열은 라미네이트(40)와 밀봉층(42)을 통해 부분적으로 소산될 수 있고, 부분적으로 캐리어(50) 및 상호연결 비아들(54)을 통해 소산될 수 있다. 상기 라미네이트(40)는 보통 폴리이미드로 형성된다. 전형적인 CSSP에서, 상기 라미네이트는 상기 패키지내의 전자 요소들에 대한 적합한 기계적인 보호를 제공하기 위하여 약 40㎛ 두께를 가진다. 상기 밀봉층(42)은 보통 약 10㎛인, 구리의 매우 얇은 코팅이다. 상기 밀봉층 자체는 적합한 기계적인 보호를 제공하기에 충분하지 않다. 더욱이, 라미네이트가 없는 경우, 상기 얇은 구리층은 상기 다이(30)와 상기 패키지 캐리어(50)의 상부면 사이의 갭을 밀봉하기 위하여 상기 패키지의 상부에 직접 증착될 수 없다. 상기 라미네이트(40)는 상기 다이(30)로부터 상기 캐리어(50)의 상부면으로의 유연한 전이를 제공한다. 하지만, 상기 라미네이트(40)는 빈약한 열 전도체이고, CSSP에서의 층 구조는 열 제거에 효과적이지 않다.In an encapsulated package, such as the chip-size SAW package (CSSP) shown in FIG. 4, the heat generated inside the encapsulated package can be partially dissipated through the laminate 40 and the sealing layer 42, and partially Can be dissipated through the carrier 50 and interconnect vias 54. The laminate 40 is usually formed of polyimide. In a typical CSSP, the laminate is about 40 μm thick to provide suitable mechanical protection for the electronic elements in the package. The sealing layer 42 is a very thin coating of copper, usually about 10 μm. The sealing layer itself is not sufficient to provide suitable mechanical protection. Moreover, in the absence of a laminate, the thin copper layer cannot be deposited directly on top of the package to seal the gap between the die 30 and the top surface of the package carrier 50. The laminate 40 provides a flexible transition from the die 30 to the top surface of the carrier 50. However, the laminate 40 is a poor thermal conductor, and the layer structure in the CSSP is not effective at removing heat.
본 발명에 의하면, 열 제거는 패키지(60)의 상부에서 상기 라미네이트(40)의 영역을 감소시키거나 제거함으로써 개선될 수 있다. 상기 라미네이트(40)가 부분적으로 제거되거나 감소된 후, 클리어된 영역(44)이 상기 패키지(60)의 상부에 생성된다. 상기 라미네이트(40)는 많은 다른 방법들로 제거될 수 있다. 예를 들어, 도 5에 도시된 바와 같이, 레이저 절단 기계가 개별 패키지들(60)에서 라미네이트의 일부를 제거하는데 사용될 수 있다.According to the present invention, heat removal can be improved by reducing or eliminating the area of the laminate 40 on top of the package 60. After the laminate 40 is partially removed or reduced, a cleared area 44 is created on top of the package 60. The laminate 40 can be removed in many different ways. For example, as shown in FIG. 5, a laser cutting machine can be used to remove a portion of the laminate in the individual packages 60.
대안적으로, 상기 밀봉층(42)이 상기 라미네이트(40)의 상부에 증착되기 전에(도 3c), 상기 패키지들(60)의 상부에 있는 라미네이트의 일부는 도 6a에 도시된 바와 같이, 상기 패키지들 사이의 라미네이트 영역들과 함께 제거될 수 있다. 상기 밀봉층(42)이 상기 플립-칩 패키징 프로세스에서 상기 라미네이트(40)의 상부에 증착될 때, 상기 밀봉층(42)의 일부는 상기 클리어된 섹션(44)을 채운다. 이와 같이, 상기 밀봉층(42)은 상기 다이(30)와 직접 접촉하거나, 그것은 라미네이트 물질의 얇은 층에 의해 상기 다이(30)로부터 분리된다.Alternatively, before the sealing layer 42 is deposited on top of the laminate 40 (FIG. 3C), a portion of the laminate on top of the packages 60 may be removed as shown in FIG. 6A. It can be removed together with the laminate areas between the packages. When the sealing layer 42 is deposited on top of the laminate 40 in the flip-chip packaging process, a portion of the sealing layer 42 fills the cleared section 44. As such, the sealing layer 42 is in direct contact with the die 30 or it is separated from the die 30 by a thin layer of laminate material.
도 6b에 도시된 바와 같이, 상기 밀봉층(42)이 상기 라미네이트(40)의 상부에 증착된 후, 상기 밀봉층의 일부와 함께 상기 패키지들(60)의 상부에서 상기 라미네이트 영역들을 제거하는 것이 또한 가능하다.As shown in FIG. 6B, after the sealing layer 42 is deposited on top of the laminate 40, removing the laminate regions on top of the packages 60 with a portion of the sealing layer. It is also possible.
상기 밀봉층의 열 제거 기능을 증강시키기 위하여, 도 7에 도시된 바와 같이, 상기 클리어된 섹션(44)의 상부에 더 두꺼운 밀봉층(42')을 증착하는 것이 가능하다. 상기 패키지의 상부에 있는 상기 밀봉층의 두께는 예를 들어 100㎛일 수 있다.In order to enhance the heat removal function of the sealing layer, it is possible to deposit a thicker sealing layer 42 'on top of the cleared section 44, as shown in FIG. The thickness of the sealing layer on the top of the package may be 100 μm, for example.
상기 패키지(60)에서의 열 소산은 도 8에 도시된 바와 같이, 복수의 열 비아들(80)을 제공함으로써 또한 추가로 개선될 수 있다. 상기 열 비아들(80)은 상기 캐리어의 상부면상의 상기 밀봉층(42)으로부터 상기 캐리어(50)의 하부면까지 열 경로들을 제공한다. 상기 하부면상에서, 상기 열 경로들은 예를 들어, 표면 장착 소자(SMD)에 있는 접지면에 연결될 수 있다.Heat dissipation in the package 60 may also be further improved by providing a plurality of thermal vias 80, as shown in FIG. 8. The thermal vias 80 provide thermal paths from the sealing layer 42 on the upper surface of the carrier to the lower surface of the carrier 50. On the bottom surface, the thermal paths can be connected to a ground plane in, for example, a surface mount element SMD.
상기 라미네이트(40)를 덮는 상기 밀봉 부분(42)과 상기 다이(30) 위의 클리어된 영역(44)을 덮는 밀봉 부분(42')(도 5, 도 6b, 도 7 및 도 8을 참조하라)은 동일한 물질로 형성될 수 있어서, 상기 클리어된 영역(44)이 형성된 후(도 6a를 참조하라) 그들이 동시에 증착될 수 있다는 것은 주목되어야 한다. 대안적으로, 상기 부분(42)과 상기 부분(42')은 다를 수 있다. 상기 밀봉 부분(42')은 또한 상기 부분(42)과 중첩될 수 있거나 도 9에 도시된 바와 같이 심지어 전체 패키지(60')를 덮을 수 있다. 더욱이, 도 10에 도시된 바와 같이, 기밀성이 있거나 없는, 부가적인 열 전도층(43)이 열 소산을 추가로 개선하기 위하여 상기 밀봉 부분(42')의 상부에 배치될 수 있다. 게다가, 상기 클리어된 영역(44)은, 나머지 부분이 충분히 얇아서 열 장벽으로서 동작하지 않는 한, 반드시 상기 라미네이트 물질이 없는 것은 아니다.See the sealing portion 42 'covering the laminate 40 and the sealing portion 42' covering the cleared area 44 above the die 30 (FIGS. 5, 6B, 7 and 8). It can be noted that can be formed of the same material so that they can be deposited simultaneously after the cleared area 44 is formed (see FIG. 6A). Alternatively, the portion 42 and the portion 42 'may be different. The sealing portion 42 ′ may also overlap the portion 42 or may even cover the entire package 60 ′ as shown in FIG. 9. Furthermore, as shown in FIG. 10, an additional heat conducting layer 43, with or without airtightness, may be disposed on top of the sealing portion 42 ′ to further improve heat dissipation. In addition, the cleared area 44 is not necessarily free of the laminate material, unless the remainder is thin enough to operate as a thermal barrier.
도 11에 도시된 바와 같이, 음향 미러와 FBAR 소자(1')내의 기판 사이에 열 분산층(45)을 배치함으로써 상기 CSSP내에서 열 분산을 추가로 개선하는 것이 가능하다. 상기 층(45)은 질화 알루미늄(AIN) 또는 어떤 양호한 열 전도 유전체로 형성될 수 있다.As shown in Fig. 11, it is possible to further improve heat dissipation in the CSSP by disposing a heat dissipation layer 45 between the acoustic mirror and the substrate in the FBAR element 1 '. The layer 45 may be formed of aluminum nitride (AIN) or any good heat conducting dielectric.
따라서, 본 발명이 본 발명의 바람직한 실시예에 관해 설명되었을지라도, 본 발명의 형태 및 상세에 있어서의 상기한 변경과 다른 다양한 변경들, 생략들 및 변형들이 본 발명의 범위를 벗어나지 않고 행해질 수 있다는 것은 당업자에 의해 이해될 것이다.Thus, although the invention has been described in terms of preferred embodiments of the invention, it is to be understood that various changes, omissions and modifications other than those described above in form and detail of the invention can be made without departing from the scope of the invention. It will be understood by those skilled in the art.
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| US10/769,460 US6992400B2 (en) | 2004-01-30 | 2004-01-30 | Encapsulated electronics device with improved heat dissipation |
| US10/769,460 | 2004-01-30 |
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| KR20070000459A true KR20070000459A (en) | 2007-01-02 |
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| US6509813B2 (en) * | 2001-01-16 | 2003-01-21 | Nokia Mobile Phones Ltd. | Bulk acoustic wave resonator with a conductive mirror |
| DE10136743B4 (en) | 2001-07-27 | 2013-02-14 | Epcos Ag | Method for the hermetic encapsulation of a component |
| CN100557967C (en) | 2001-09-28 | 2009-11-04 | 埃普科斯股份有限公司 | Method for encapsulating an electrical component and surface wave component encapsulated thereby |
| JP4173308B2 (en) * | 2002-01-09 | 2008-10-29 | アルプス電気株式会社 | SAW filter |
-
2004
- 2004-01-30 US US10/769,460 patent/US6992400B2/en not_active Expired - Lifetime
- 2004-10-15 JP JP2006550319A patent/JP2007535230A/en active Pending
- 2004-10-15 EP EP04769650.5A patent/EP1766679B1/en not_active Expired - Lifetime
- 2004-10-15 KR KR1020067015444A patent/KR100825108B1/en not_active Expired - Fee Related
- 2004-10-15 CN CN2004800406541A patent/CN101421920B/en not_active Expired - Fee Related
- 2004-10-15 WO PCT/IB2004/003383 patent/WO2005081618A2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US6992400B2 (en) | 2006-01-31 |
| WO2005081618A3 (en) | 2009-04-09 |
| JP2007535230A (en) | 2007-11-29 |
| EP1766679B1 (en) | 2019-05-01 |
| KR100825108B1 (en) | 2008-04-25 |
| EP1766679A4 (en) | 2010-02-24 |
| CN101421920A (en) | 2009-04-29 |
| CN101421920B (en) | 2011-08-10 |
| US20050167854A1 (en) | 2005-08-04 |
| WO2005081618A2 (en) | 2005-09-09 |
| EP1766679A2 (en) | 2007-03-28 |
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